Re Ga Ma Pa Dha Ni
* A thaat cannot contain both the natural and altered versions of a note
* A thaat, unlike a raga, does not have separate ascending and descending lines
* A thaat has no emotional quality (which ragas, by definition, do have)
* Thaats are not sung but the ragas produced from the thaats are sung

One can arbitrarily designate any pitch as Sa (the tonic) and build the series from there. While all thaats contain seven notes, many ragas (of the audav and shadav